JPH041017A - Lamination apparatus of multilayer extrusion molding machine - Google Patents

Abstract

PURPOSE:To make the thickness ratio of laminated sheets or films constant by providing a width control apparatus forming the width dimension of the flow path of the part supplied to a die of a resin material having the larger melt index the smaller among resin materials to be used in a lamination apparatus. CONSTITUTION:A molding raw material having a circular cross section is supplied in a molten state from an extruder. A resin raw material B having a large melt index MI passes through the second inlet flow path 2b to be adjusted to predetermined width by the first width controller 10 and a resin material A having a small MI is distributed into a flat plate shape by a distributor 8 and a resin material C having a relatively large MI is passed through the third inlet flow path 2c to be adjusted to predetermined width by the second width controller 11 and all of the raw materials are supplied to a lamination chamber 2e. Three kinds of resins are superposed one upon another in the lamination chamber 2e in the order of the resin material B having the narrowest width, the resin raw material A having the largest width and the resin material C having intermediate width. Subsequently, the respective layers are passed through a connection pipeline 14 and widened in all directions at the speeds corresponding to the magnitudes of the MIs of the respective raw materials by the extrusion pressure applied to the die to become equal extrusion width.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a laminating device for a multilayer extrusion molding machine.

(b) Conventional technology By attaching a die with a wide opening to an extrusion molding machine and extruding the molten resin into a thin plate shape, and cooling this,
A resin film or sheet is produced. In the production of resin sheets, etc., in order to improve adhesion to mating parts and gas permeability, multilayer extrusion molding machines are used to overlay and extrude resins and adhesives with different properties, creating multilayer materials. This is what is being done. For example, tofu containers are made of polystyrene (PS), which has good deep drawability.
) It is necessary to form a sheet into a box-shaped container with a rim, put tofu in this container, and seal it by thermally adhering a polypropylene (PP) film to the rim as a lid member, but PS and PP are different. Poor thermal adhesion. For this purpose, an adhesive resin (hereinafter referred to as adhesive) is sandwiched between molten PS and PP in advance and extruded simultaneously to produce a laminated sheet. Next, this laminated sheet is deep drawn into a box-shaped container with a rim, with the PP inside. Separately, prepare a PP film that is a lid member (. By bringing the edge of the box-shaped container containing tofu into contact with the lid member and applying heat, the PP film of the container and the lid member are brought into contact with each other. The surface of the PP film will be thermally bonded to the surface of the PP film.
Good adhesion is possible.

(c) Problems to be Solved by the Invention However, when draw forming is performed using a multilayer sheet that is simultaneously extruded with an adhesive sandwiched between the above-mentioned thicker PS and PP, defective products such as deformation may occur. The problem is that it is easy. When such a multilayer sheet is observed, each layer has a predetermined thickness ratio at the ends of the sheet corresponding to both ends in the width direction of the die, as shown in Fig. 8, which is a cross section taken in a direction perpendicular to the extrusion direction. It can be seen that there are some parts that are not. When manufacturing a multilayer sheet as described above, among the resin materials used, a material with a large melt index (MI), that is, a material with good fluidity, tends to spread quickly in all directions during extrusion. As a result, the material
Since it wraps around to the side, it is thought to have a cross-sectional shape as shown in the above figure. It has been found that if drawing is performed using a sheet portion that deviates from such a predetermined thickness ratio, defects will occur. Therefore, it is necessary to cut and remove both end portions and supply only a portion having a predetermined thickness ratio as a sheet material, resulting in poor yield. There has therefore been a need to produce multilayer sheets having a predetermined thickness ratio across their width. The present invention aims to solve these problems.

(D) Means for Solving the Problems The present invention provides a method for manufacturing a multilayer sheet or a multilayer film, in which a material having a large MI among the resin materials used is the width dimension of the flow path in the portion fed to the die. The above problem is solved by providing a width adjusting device in the laminating apparatus that can adjust the width dimension so that a plurality of resin materials ( A, B, and C) are provided in a multilayer extrusion molding machine that overlaps and extrudes as a multilayer resin sheet or multilayer resin film, and a plurality of inlet channels (2a, 2b, and 2c) through which a plurality of resin materials are separately supplied; , a stacking chamber (2e) for stacking these resin materials, and an outlet channel (2d) for sending out the stacked resin materials. A width adjustment device (10, 11 or 30, 31) capable of adjusting the width dimension of the resin material (B or C) is provided between the stacking chamber (2e) and the resin material (B or C).

Note that the width adjustment device (10 or 11) includes a cylindrical shaft member (10a) provided between the inlet channel (2b or 2c) and the lamination chamber (2e), and a fixing plate attached to this. (10c) and a bolt (10b) that fixes the rotational position of the shaft member (LOA) via a fixing plate (10c). Groove whose width gradually changes in the direction of
) should be provided.

Further, the width adjustment devices (30 and 31) include valve members (30C and 31C) disposed between the artificial passageway (2b) and the laminated chamber (2e), and valve members (30C and 31C) that adjust the width of the passageway. A screw device (30
a and 30b or 31a and 31b). Note that the symbols in parentheses indicate corresponding members in the embodiment.

(e) Function The molten sheet raw material extruded into a cylindrical shape for each material by each extruder is first introduced into the inlet channel of the laminating device. Here, the smallest MI is set as the maximum width, and the larger the MI, the narrower the width, and the pieces are stacked in a band shape to form a laminated material. The laminated material is then sent to the gou through the outlet channel and subjected to extrusion pressure. The larger the MI, the faster each layer spreads in all directions, but the larger the MI, the narrower the width of each layer, so in the end, a laminated sheet with a predetermined thickness ratio that is almost uniform is extruded. be done.

(f) Example Figures 1 to 3 show a laminating apparatus for manufacturing a three-layer sheet according to a first example of the present invention. The main body 2 has a box shape,
There are three entrance channels 2a.

2b and 2C and one outlet flow path 2d. A disk-shaped first side plate 4 and a second side plate 6 are attached to both side surfaces of the main body 2. A laminated chamber 2e communicating with each flow path 2a, 2b, 2c, and 2d is connected to the main body 2. It is formed by a first side plate 4 and a second side plate 6. On the upstream side of the lamination chamber 2e, there is a rectifier 8 that arranges the cylindrical molten resin into a flat plate shape.
is located. The first width adjustment device 10 includes a first side plate 4
A shaft member 10a, which will be described later, is fitted into a hole 6a provided in the second side plate 6, further crossing the downstream side of the stacking chamber 2e. A groove 10d is provided on the circumferential surface of the shaft member 10a of the first width adjusting device 10 in a direction perpendicular to the axis (see FIG. 4). Groove 1
0d is not parallel, but has a shape that decreases from width ■ to width W over approximately 330 degrees from 0 degrees on the circumference of the shaft member 10a, as shown in a developed view in FIG. The shaft member 10a is connected to the first bolt 10b via the fixing plate 10c.
By screwing into the side plate 4, it can be fixed to the first side plate 4 so as not to rotate. Thereby, it is possible to adjust the second raw material B supplied to the second entrance flow path 2b to a predetermined raw material width and flow it into the stacking chamber 2e. A similar second width adjustment device 11 is attached to the second side plate 6 in the opposite direction to the first width adjustment device 10, and adjusts the third raw material C supplied to the third inlet flow path 2c to a predetermined raw material. It is possible to adjust the width and make it flow into the stacking chamber 2e. A flange 12 is attached to the outlet flow path 2d side of the main body 2, and is connected to a flange 16 on the gouey side via a connecting pipe line 14. Outlet channel 2d.

Flange 12. The cross-sectional shapes of the flow paths of the connecting pipe line 14 and the flange 16 are rectangular as shown in FIG. The main body 2 is provided with a pair of advancing and retracting devices 18 and 2o that penetrate from the upper left and lower left in FIG. 1 to the stacking chamber 2e. The advancing/retracting device 18 includes a push bolt 1 that has a through hole in the center and is screwed into the main body 2.
8a, a pull bolt 18b inserted into the through hole, and a reciprocating member 18c attached to the pull bolt 18b. The reciprocating member 18c has a shape in which a part of a prism is shaved off obliquely, and the negative side thereof is connected to the shaft member 11a of the second width adjusting device 11, as shown in FIG.
It is designed to face the cylindrical surface of. Moving member 18c
The width dimension of the groove lid facing the above-mentioned - surface (V - W'
) will determine the width dimension of the third raw material C. Similarly, the advancing/retracting device 20 has a through hole in the center, a push bolt 20a screwed into the main body 2, a pull bolt 20b inserted into the through hole, and an advance/retreat member 20c attached to the pull bolt 18b. It is composed of.

The reciprocating member 20c has a shape in which a part of a prism is obliquely shaved off, and the negative surface thereof faces the cylindrical surface of the shaft member 10a of the first width adjusting device 10. The width dimension of the second raw material B is determined by the width dimension of the groove 10d facing the above-mentioned negative surface of the advancing/retracting member 20c. The advancing/retracting devices 18 and 20 advance and retreat the advancing/retracting members 18c1 and 20c in the direction toward each other or away from each other within the stacking chamber 2e, thereby opening the first inlet flow path 2.
It is possible to change the flow rate of the first raw material A introduced into the stacking chamber 2e through the stacking chamber 2e. In addition, the main body 2. A heater 22 is attached to each of the first side plate 4 and the second side plate 6.

Next, the operation of this first embodiment will be explained. Each entrance performance path 2
Molten raw materials each having a circular cross section are supplied to a, 2b, and 2c from a plurality of extruders (not shown). The molding raw material is maintained at a predetermined temperature by a heater 22. Here, the resin raw material A supplied to the first entrance channel 2a has a small MI (for example, PP), and the resin raw material B supplied to the second entrance channel 2b has a
It is assumed that the resin material C has a relatively large MI (for example, PS) and the resin raw material C supplied to the third entrance channel 2c has a relatively large MI (for example, resin for adhesive). In advance, the groove 10d of the first width adjustment device 10 is aligned with the advance/retreat member 2.
With the rotational position adjusted so that the groove width corresponds to the MI value of resin raw material B at the position facing 0c,
Screw in the bolt 10b and fix it with the fixing plate 10c,
I'll keep it. Similarly, the second width adjustment device 11 also adjusts and fixes the rotational position of the shaft member 11a so that the groove width corresponds to the resin raw material COMI value. Resin raw material B
passes through the second entrance channel 2b, is adjusted to a predetermined width by the first width adjustment device 10, and is supplied to the stacking chamber 2e.

After the resin raw material A with a small MI is rectified into a flat plate shape through the rectifier 8, it is supplied to the lamination chamber 2e without passing through the width adjustment device, since there is no need to regulate the width dimension. The resin raw material C passes through the third entrance channel 2C, is adjusted to a predetermined width by the second width adjustment device 11, and is supplied to the lamination chamber 2e. Since the thickness of each layer is determined by the supply amount per unit time, each supply amount may be adjusted so as to achieve a predetermined thickness ratio. At this time, if there is a large difference in the flow velocity of each molten resin in the lamination chamber 2e, the thickness accuracy will be affected, so the flow velocity is adjusted using the advancement/retraction devices 18 and 20. In this way, as shown in FIG. 7, three types of resin are stacked in the order of resin raw material B having the narrowest width, resin raw material A having the widest width, and resin raw material C having an intermediate width in the lamination chamber 2e. will be done. This molten laminated material is led to a die (not shown) through the connecting pipe 14 and is subjected to extrusion pressure. This extrusion pressure causes each layer to be expanded in all directions at a speed corresponding to the size of MI, so that the extrusion width is ultimately equal. In this way, a laminated sheet or a laminated film having a predetermined thickness ratio is manufactured.

Next, FIG. 6 shows a second embodiment of the present invention. Width adjustment device 3
0 and 31 are fixed members 30a and 31a each fixed to the first side plate 4 and second side plate 6 and provided with female threads, and bolts 30b and 31 screwed into these female threads.
b, and bolts 30b and 31b arranged in the stacking chamber 2e.
and valve members 30c and 31c connected to the valve member 30c and 31c, respectively. Bolts 3 are attached to the first side plate 4 and the second side plate 6.
Through holes 30d and 31d through which 0b and 31b pass, and recesses 30e and 31e into which valve members 30c and 31c are fitted.
and is provided. In this second embodiment, two sets of width adjusting devices 3o and 31 are used to adjust the width dimension of one resin passage.

The operation of this second embodiment will be explained. Bolts 30b and 3
1b to make the valve members 30c and 31c into the recess 30.
The width W of the flow path formed by the valve members 30c and 31c is adjusted by moving the valve members 30c and 31e in the direction of ejection or in the direction of inflow. Other operations are similar to those described in the first embodiment.

In the above description, the advancing and retracting devices 18 and 20 are provided to adjust the flow rate of the resin raw material A, but similar devices may be provided in the flow paths of the resin raw materials B and C.

Moreover, although the cross-sectional shape of the groove 10d has been described as being rectangular, it may be formed into a trapezoidal shape or the like.

Note that instead of the fixing members 30a and 31a, the first side plate 4
and a through screw hole is provided in the second side plate 6 instead of a through hole,
Bolts 30b and 31b may be screwed into these through holes.

(G) As described in detail, according to the present invention, the width of the material before being supplied to the die can be freely adjusted according to the MI value of the resin material used, so The thickness ratio of sheets, films, etc. can be made constant.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a laminating apparatus according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. ■The arrow view, Figure 4 is the first diagram of the present invention.
FIG. 5 is a perspective view of the shaft member used in the embodiment; FIG. 5 is a developed view of the shaft member used in the first embodiment of the present invention; FIG. FIG. 7 is a cross-sectional view of laminated materials, and FIG. 8 is a cross-sectional view of a conventional laminated sheet. 2... Main body, 2a, 2b, 2c... Inlet channel, 2
d・・Outlet channel, 2e・・Lamination chamber, 4・・First side plate, 6・・Second side plate, 10°11・・Width adjustment device,
10a... Shaft member, 10b... Bolt, 10c...
・Fixing plate, 10d・・Groove, 30・31・・Width adjustment device, 30a, 31a...Fixing member, 30b. 31b...Bolt, 30c, 31c...Valve member, A
-B-C...Resin material. Patent applicant: Japan Steel Works Co., Ltd.
Person Patent Attorney Toshiyuki Miyauchi Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Provided in a multilayer extrusion molding machine that overlays a plurality of resin materials (A, B, and C) and extrudes them as a multilayer resin sheet or multilayer resin film, and the plurality of resin materials are supplied separately. In a laminating apparatus having a plurality of inlet channels (2a, 2b, and 2c), a laminating chamber (2e) for stacking these resin materials, and an outlet channel (2d) for sending out the stacked resin materials, the above-mentioned A width adjustment device (10, 11 or 30/31) capable of adjusting the width dimension of the resin material (B or C) is provided between the inlet channel (2b or 2c) and the lamination chamber (2e). A laminating device for a multilayer extrusion molding machine featuring: 2. The width adjustment device (10 or 11) is connected to the inlet flow path (
2b or 2c) and the lamination chamber (2e), a fixing plate (10c) attached to this, and a shaft member (10a) via the fixing plate (10c). ) for fixing the rotational position of the bolt (10b);
The shaft member (10a) has a groove (10d) whose width gradually changes in the direction perpendicular to the axis on the circumferential surface.
2. A laminating device for a multilayer extrusion molding machine according to claim 1, further comprising: 3. The width adjustment devices (30 and 31) are connected to the inlet flow path (
2b) and the laminated chamber (2e), and a screw device (30a) that can move these valve members in the direction of increasing or decreasing the channel width.
and 30b or 31a and 31b), the laminating device for a multilayer extrusion molding machine according to claim 1.